A bunion is a bony bump that forms at the base of the big toe, where the toe meets the foot. It develops when the bones in the front of the foot shift out of alignment: the big toe angles inward toward the smaller toes while the head of the long bone behind it (the first metatarsal) pushes outward, creating that visible bump on the side. About 19% of people worldwide have one, making it one of the most common foot deformities.
What Actually Happens Inside the Foot
A bunion isn’t new bone growth or a calcium deposit. It’s a structural shift in the joint itself. The first metatarsal drifts inward toward the midline of the body while the big toe drifts outward toward the second toe. This misalignment causes the joint to jut out, and the skin over it often becomes red and irritated from rubbing against shoes.
The deformity is more complex than it looks from the outside. The metatarsal bone doesn’t just move sideways. It also rotates and lifts slightly, which destabilizes the small bones (called sesamoids) that sit under the joint and help with push-off when you walk. Over time, this rotation worsens the misalignment and makes the joint increasingly inefficient at its job. That’s why bunions tend to get progressively worse rather than staying the same size.
Who Gets Bunions and Why
Women develop bunions at roughly twice the rate of men: about 24% of women compared to 11% of men. Age matters too. The prevalence nearly doubles after age 60, reaching about 23%, compared to around 12% in adults under 60. Children and teens can also develop bunions, though it’s less common at about 11%.
The exact cause isn’t fully settled, but genetics plays a major role. The shape of your foot, the looseness of your ligaments, and the way your foot distributes weight during walking are all inherited traits that influence your risk. Flat feet are a known risk factor, as are inflammatory conditions like rheumatoid arthritis and osteoarthritis.
Tight shoes, high heels, and narrow toe boxes have long been blamed for causing bunions, but the relationship is more nuanced. Research suggests that poorly fitting shoes probably don’t cause bunions on their own. Instead, they accelerate the problem in people who are already structurally predisposed. This explains why bunions exist in populations that rarely wear shoes, and why some people wear heels for decades without developing one.
Symptoms Beyond the Bump
The visible bump is the hallmark, but bunions cause a range of symptoms that can affect the entire front of the foot:
- Pain: ongoing or intermittent, especially when walking or wearing shoes that press on the bump
- Swelling and redness: around the big toe joint, sometimes warm to the touch
- Stiffness: limited range of motion in the big toe, which can change the way you walk
- Corns and calluses: these develop where the first and second toes overlap and rub against each other
- Hard skin on the sole: caused by altered pressure distribution as the foot compensates for the misalignment
As bunions progress, they can trigger secondary problems. The fluid-filled cushioning pads near the joint can become inflamed (bursitis), causing sharp pain. The second toe, crowded by the big toe’s new angle, may develop an abnormal bend at its middle joint, known as a hammertoe. Some people also develop pain and swelling in the ball of the foot because the shifted bones change how weight is distributed during walking.
How Bunions Are Diagnosed
A doctor can usually identify a bunion just by looking at your foot, but an X-ray is the standard tool for measuring severity. Two key angles determine how advanced the deformity is. The angle between the first and second long foot bones is normally 8 to 12 degrees; anything beyond that indicates the metatarsal has drifted too far inward. The angle between the big toe and the metatarsal is normally under 15 to 20 degrees. The larger these angles, the more severe the bunion, and these measurements guide decisions about whether surgery is needed and what type would work best.
Managing Bunions Without Surgery
Conservative treatment won’t reverse a bunion, but it can reduce pain and slow progression. The most common approaches are footwear changes, orthotic inserts, and targeted exercises.
Custom or over-the-counter foot orthoses can redistribute pressure away from the big toe joint and midfoot. One clinical trial found that orthotics reduced bunion-related pain at six months. Night splints hold the toe in a straighter position while you sleep, though evidence on whether they meaningfully change the angle over time is limited. A progressive resistance exercise program focused on strengthening the muscles that flex the big toe improved strength by about 20% over 12 weeks in one trial, which may help counteract the mechanical imbalance driving the deformity.
Toe spacers (worn between the first and second toes) and protective padding over the bump can make shoes more comfortable day to day. Ice and anti-inflammatory measures help during flare-ups of pain and swelling.
Choosing the Right Shoes
Footwear won’t fix a bunion, but the wrong shoes will reliably make it worse. The most important feature is a wide toe box, not just a shoe labeled “wide” (which may add width throughout the shoe) but one specifically designed with room at the front where the toes spread. A tall toe box matters too, since vertical pressure from a low ceiling pushes down on already crowded toes.
A soft, stretchy knit upper is more forgiving than stiff mesh. Knit material conforms to the shape of the bunion rather than pressing against it, reducing friction and the hot spots that lead to blisters. The tradeoff is slightly less breathability compared to mesh, but the comfort difference is significant for most people with bunions. Avoid pointed toe boxes and high heels entirely. Both push the big toe inward and increase pressure on exactly the part of the foot you’re trying to protect.
When Surgery Makes Sense
Surgery becomes an option when pain interferes with daily activities and conservative measures haven’t provided enough relief. The procedure, called an osteotomy or bunionectomy, involves cutting the misaligned bone, repositioning it, and securing it with small screws. The goal is to straighten the toe and eliminate the bump.
Traditional open surgery uses a larger incision and a saw to cut the bone. It remains the stronger correction for severe bunions and carries a lower risk of the bunion returning in those cases. Minimally invasive surgery uses tiny incisions and a precision burr instead of a saw, which disrupts less soft tissue. The result is less swelling, less pain after the procedure, smaller scars, and a faster return to normal activity. For mild to moderate bunions, a technique called PECA (Percutaneous Chevron Akin) repositions both the metatarsal and the toe bone through small skin punctures. For severe deformities, a minimally invasive Lapidus technique fuses a joint closer to the arch, correcting the bunion in all three planes including rotation.
What Recovery Looks Like
Most bunion surgeries are outpatient, meaning you go home the same day. You won’t be able to drive immediately after, so arrange a ride in advance. Depending on the type of procedure, your surgeon may allow you to put weight on the foot right away in a protective boot, or you may need crutches or a knee scooter for several weeks.
Expect to wear a protective shoe or boot during the initial healing phase. Most people begin regaining normal foot function between six and 12 weeks after surgery. Full recovery, including returning to athletic activities or wearing regular shoes comfortably, takes longer and varies by the complexity of the correction. Minimally invasive techniques generally shorten these timelines compared to traditional open surgery.